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Letting a stock 727 shift itself in an 11 second car??? #1032960 07/15/11 02:32 PM 07/15/11 02:32 PM
Joined: Jun 2006 Posts: 834 Beavercreek, Ohio OA5599 OP super stock
OA5599 OP super stock Joined: Jun 2006 Posts: 834 Beavercreek, Ohio	I was thinking I read or heard somewhere that there is a higher risk of transmission failure if you just leave it in drive and let it shift. Any merit to this or did I dream it? Car is a 3500lb Cuda running mid/low 11s with a tight 10" converter. Going racing tonight and the plan is to let it shift itself for consistency sake. Any thoughts?

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: OA5599] #1032961 07/15/11 02:35 PM 07/15/11 02:35 PM
Joined: Nov 2003 Posts: 5,160 Texas dannysbee master
dannysbee master Joined: Nov 2003 Posts: 5,160 Texas	Did it a lot with a 12 second Mopar. No problems with reliability or consistency. Getting old just means you were smarter than some and luckier than others.

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: OA5599] #1032962 07/15/11 02:36 PM 07/15/11 02:36 PM
Joined: Jan 2003 Posts: 24,562 Brookeville, Md Mr.Yuck Not enough dumb comments...yet
Mr.Yuck Not enough dumb comments...yet Joined: Jan 2003 Posts: 24,562 Brookeville, Md	if you have the kick-dow....err throttle pressure linkage set-up I don't see why you couldn't. [IMG]http://i66.tinypic.com/pui5j.jpg[/IMG] Coming soon!!!!

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: Mr.Yuck] #1032963 07/15/11 02:57 PM 07/15/11 02:57 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	...a higher UPshift gov ...and a tad more line-pressure .. been-there ..done-that ..

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: OA5599] #1032964 07/15/11 03:09 PM 07/15/11 03:09 PM
Joined: Jan 2003 Posts: 16,923 NC 440Jim I Live Here
440Jim I Live Here Joined: Jan 2003 Posts: 16,923 NC	One thing to consider is that while in "Drive" and sitting at the starting line, the trans will be in 1st gear without applying the rear (low) band. If something happens, and the driver decides/needs to lift the throttle; they need to be careful how they reapply the throttle if driving speed would result in the trans going/staying into 1st gear which would reload the sprag (not recommended). The proper burnout procedure for the stock valve body is also recommended. 1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: OA5599] #1032965 07/15/11 03:13 PM 07/15/11 03:13 PM
Joined: Aug 2003 Posts: 43,127 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,127 Bend,OR USA	Trans. fluid temps. may affect the shifting RPM when it gets hotter, if you go rounds I have seen my converter do different stalls with cold temps. versus hot fluid when going rounds Last edited by Cab_Burge; 07/16/11 01:52 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Letting a stock 727 shift itself in an 11 second ca [Re: 440Jim] #1032966 07/15/11 03:19 PM 07/15/11 03:19 PM
Joined: Jan 2003 Posts: 2,697 Renton Wa T topfueldart master
topfueldart master T Joined: Jan 2003 Posts: 2,697 Renton Wa	Quote: One thing to consider is that while in "Drive" and sitting at the starting line, the trans will be in 1st gear without applying the rear (low) band. 11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost. 9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: Cab_Burge] #1032967 07/15/11 03:22 PM 07/15/11 03:22 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	Quote: Trans. fluid temps. may affect the shifting RPM when it gets hotter, if you go rounds I have seen my converter do different stalls with cold temps. versus hooter fluid when going rounds .... ....did you get that ATF with some of those tasty wings ? ..

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: dOc !] #1032968 07/16/11 12:16 PM 07/16/11 12:16 PM
Joined: Jan 2003 Posts: 1,374 Houston,Tx. L Lee446 pro stock
Lee446 pro stock L Joined: Jan 2003 Posts: 1,374 Houston,Tx.	Doc beat me to it! Thinking of bad puns about hooter fluid on your dipstick! Jim, how about telling everyone the proper procedure for a stock VB? I could use a brush up.

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: Lee446] #1032969 07/16/11 01:03 PM 07/16/11 01:03 PM
Joined: Nov 2004 Posts: 2,825 Sk. Canada RemCharger master
RemCharger master Joined: Nov 2004 Posts: 2,825 Sk. Canada	First rule of racing a stock vb 727; If the tranny is in first gear, your shifter should be in first gear An automatic will start out in low regardless of shifter position(its not a c6!) so you better start out in low position...

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: OA5599] #1032970 07/16/11 06:50 PM 07/16/11 06:50 PM
Joined: Nov 2003 Posts: 377 NW Indiana USA 727specialist enthusiast
727specialist enthusiast Joined: Nov 2003 Posts: 377 NW Indiana USA	I did it for a year in a 11.90 car with no real problems. The bad part is the 1/2 shift in the water box. When I went through the trans the fingers for the overrunning clutch springs were always beat up and bent. So you are taking your chances there. When I went manual I got more consistent ETs

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: dOc !] #1032971 07/16/11 08:17 PM 07/16/11 08:17 PM
Joined: Oct 2005 Posts: 164 Savannah, GA mopar400 member
mopar400 member Joined: Oct 2005 Posts: 164 Savannah, GA	Quote: ...a higher UPshift gov ...and a tad more line-pressure .. been-there ..done-that .. Ran mine like this for years. Very reliable. I think the trans. has 4-5 seasons on it. I use to race Sat. and Sunday for 2-3 of those yrs. It has a lot of rounds! I just service it and keep the bands adjusted. Consistency was pretty good. My cars been sitting for about 6 years. I'm thinking about going manual on a new transmission just to change it up this time. 1965 Fury II 1970 Challenger 440, 509 cam, 11:1 w/ 452 iron heads, 6.99 1/8, 11.29@ 120mph 1/4 (1999 Magnolia Drag strip track champion) 1992 Jeep XJ Crawler

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: mopar400] #1032972 07/16/11 08:22 PM 07/16/11 08:22 PM
Joined: Oct 2005 Posts: 164 Savannah, GA mopar400 member
mopar400 member Joined: Oct 2005 Posts: 164 Savannah, GA	1965 Fury II 1970 Challenger 440, 509 cam, 11:1 w/ 452 iron heads, 6.99 1/8, 11.29@ 120mph 1/4 (1999 Magnolia Drag strip track champion) 1992 Jeep XJ Crawler

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: OA5599] #1032973 07/16/11 08:57 PM 07/16/11 08:57 PM
Joined: Feb 2005 Posts: 4,311 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,311 Prospect, PA	I leave mine in drive. I've noticed, like Cab said, the shift rpm drifts up a bit from the first run to the second run when it gets hotter, then stays about the same from there for the rest of the day. I notice it more in the cool days of late fall more. If I warmed everything up better it might not happen. I don't know the answer to your question. But I have a steel drum and ultimate sprag and will probably get a blanket before I go back out again.

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: BSB67] #1032974 07/16/11 09:07 PM 07/16/11 09:07 PM
Joined: Jun 2007 Posts: 1,161 Mississippi M Mr. T super stock
Mr. T super stock M Joined: Jun 2007 Posts: 1,161 Mississippi	I have been doing it for about 15 years now. I have a transmission cooler. I try to make sure that the engine temp. is about 140 degrees. I do my burnout in #2 and then make sure the factory shifter is in drive before I stage. It has worked fine for me.

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: BSB67] #1032975 07/16/11 09:29 PM 07/16/11 09:29 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	Quote: I leave mine in drive. I've noticed, like Cab said, the shift rpm drifts up a bit from the first run to the second run when it gets hooter, Yeah ... me thimks CB has found the latest-TRIX ... I will have to see if they sell that ATF by the 5 gal pail ..

Re: Letting a stock 727 shift itself in an 11 second car??? [Re: OA5599] #1032976 07/17/11 04:30 AM 07/17/11 04:30 AM
Joined: Jan 2005 Posts: 3,699 Newport, Mi Evil Spirit master
Evil Spirit master Joined: Jan 2005 Posts: 3,699 Newport, Mi	Quote: I was thinking I read or heard somewhere that there is a higher risk of transmission failure if you just leave it in drive and let it shift. Any merit to this or did I dream it? Car is a 3500lb Cuda running mid/low 11s with a tight 10" converter. Going racing tonight and the plan is to let it shift itself for consistency sake. Any thoughts? I used to leave with the shifter in manual low, then upshift into D at about the 60' clocks before the car would normally shift itself. It give the roller clutch the protection of the low/rev band on the launch, and the consistency of the governor controlled upshifts. I used to leave with the shifter in manual low, then upshift into D at about the 60' clocks before the car would normally shift itself. It gives the roller clutch the protection of the low/rev band on the launch, and the consistency of the governor controlled upshifts. Free advice and worth every penny... Factory trained Slinky rewinder.........

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